With the popularity of mobile messaging apps in full on frenzy, Chinese Twitter analog Sina has entered the fray with the launch of WeMeet (aka, Weimi in Chinese). The app debuted quietly in April, but today’s “official launch” comes as the company has emphasized its plans to launch additional social services to compete with rapidly growing chat client, WeChat. Sina has 500 million registered users, more than 50 million of which are active daily. [Source: TNW]